Unreal Tournament cheats and cheat codes for Playstation 2

Skip any level
Pause the gameplay and enter Up, Down, Left, Right, Right, Left, Circle.

Unlock every weapons:
Pause the gameplay and enter Left, Circle, Right, Square, Right, Left.

Stage select
Save your game and go back to the main menu. Choose "Resume Game", 
after highlight the previously saved file then press 
Up, Down, Down, Up, Left, Up, Right, Down.

Max ammo:
Pause the gameplay and enter Left, Right, Circle, Circle, Circle, 
Right, Left.

Invincibility
Pause the gameplay and enter Square, Circle, Left, Right, Circle, Square.

Unlock all playable characters:
Pause the gameplay and enter Left, Left, Circle, Circle, 
Right, Left, Circle.

Fat Mutator
Press Circle, Circle, Circle, Up, Down, Down, Up, Circle, Circle, Circle 
at the title screen. Choose multiplayer mode and select the "Fatboy Mutator"
option.

Stealth Mutator
Press Square, Square, Circle,  Circle, Square, Square, Circle, 
Circle at the title screen. Choose multiplayer mode and select the 
"Stealth Mutator" option.

Giant heads
Press Left, Right, Left, Right, Left, Right, Circle, Circle, Circle 
at the title screen. Choose multiplayer mode and select the 
"Big Head" option in "Mutators" menu.

Play 4 player mode
You need a USB keyboard and USB mouse to do this. 
Change the controller settings to set the keyboard to player 3
and the mouse to player 4.

Unlock 7 DM + 4 CTF bonus levels
Finish the game in Inhuman difficulty level.

Get 999 Redeemers
Play on the Face's Of World level for CTF. Enable the "Invincibility" 
cheats. Pick up the Redeemer. Then enable the "Max ammo" cheat code 
to get 999 Redeemers. You will not die, if you fall out of space.
Press R2 to shoot controllable rocket.